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-13=d/2
We move all terms to the left:
-13-(d/2)=0
We add all the numbers together, and all the variables
-(+d/2)-13=0
We get rid of parentheses
-d/2-13=0
We multiply all the terms by the denominator
-d-13*2=0
We add all the numbers together, and all the variables
-1d-26=0
We move all terms containing d to the left, all other terms to the right
-d=26
d=26/-1
d=-26
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